三种污水污泥对两种地被植物和土壤的影响

Effects of Three Sewage Sludges on Two Ground Cover Plants and Soil

通过田间试验研究了在不同施用量下的干化污泥、消化污泥和堆沤污泥，对结缕草和葱兰生理特性的影响，以及对土壤重金属含量的影响．结果表明：施用供试污泥对促进2种地被植物生长的作用明显．随着施用量的增加，结缕草和葱兰的主要生理指标在施用量O～3kg／m^2范围内均有显著增加，但是结缕草的叶绿素含量在施用量1～3kg／m^2范围内增幅呈减小的趋势．3种污泥之间，促进植物生长的作用大小顺序为：堆沤污泥，消化污泥，干化污泥．从施用污泥对土壤重金属含量影响的角度看，供试污泥在园林地被植物上短期施用的最高用量可为3kg／m^2．

In a field experiment, two ground cover plants （Zoysia japonica Steud and Zephyranthes candida Herb） were supplied with air-dry sludge, digested sludge and composted sludge, which were processed by draft sewage sludge as materials, and the effects of the applied sludge on the physiological parameters of the plants were studied. The results showed that the three sludges tested could improve the physiological parameters of the two ground cover plants. In the range of 0-3 kg/m^2, the main physiological parameters of the two plants increased significantly with application rate of the sludge. However, the content of chlorophyll of Zoysia japonica Steud tended to decrease with sludge application within the rate range of 1-3 kg/m^2. The growth-promoting effect of the sludges was in the order of composted sludge 〉 digested sludge 〉 air-dry sludge. When the effect of sludge application on soil heavy metals is taken into consideration, a maximum rate of sludge of 3 kg/m^2 is recommended for short-term application to landscape cover plants.